July is one of the warmer months of the year in St. Catharines, with average highs near 26°C and lows around 17.7°C (mean 21.9°C). It is a relatively wet time of year, averaging 79 mm of rainfall and 70% relative humidity across the period.
July is one of the warmer months of the year in St. Catharines. Across 45 years of records, the warmest July in St. Catharines was 2020 — when the month averaged 25.1°C — while the coldest was 1992 at 17.8°C. Typical July days reach 26°C with nights near 17.7°C. The long-term trend is warming, about 0.7°C per decade.
July is a relatively wet time of year in St. Catharines, averaging 79 mm of rainfall. The wettest July on record was 1992 with 154 mm, while the driest was 2001 at 33 mm.
Relative humidity in St. Catharines during July averages 70%. The most humid July was 2004 at 79%, and the least humid was 1988 at 64%.
July receives about 6 kWh/m²/day of solar energy in St. Catharines. The sunniest Julys were 2002, 2011 and 2018 at 6.5 kWh/m²/day, and the cloudiest was 1984 at 5.1.
Average wind speed in St. Catharines during July is 2.7 m/s. The windiest July was 2014 at 3.2 m/s, while the calmest were 1989 and 2024 at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 21.5°C | 20.5°C | 21.2°C | 23.0°C | 23.7°C | +2.2°C |
| Avg High | 25.9°C | 24.9°C | 25.2°C | 26.9°C | 27.7°C | +1.8°C |
| Avg Low | 17.1°C | 16.1°C | 17.2°C | 19.1°C | 19.6°C | +2.5°C |
| Avg Rain | 71 mm | 71 mm | 95 mm | 79 mm | 76 mm | +5 mm |
July temperatures in St. Catharines have risen by about 2.1°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 8.4°C (2001) to a record high of 34.6°C (1988).
Rainfall in July is a relatively wet time of year, averaging 79 mm, with a wettest year of 154 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.6°C per decade while lows rose 0.8°C per decade, narrowing the gap between day and night.
One of the best times to visit St. Catharines
July is one of the best times to visit St. Catharines. Expect days averaging 26°C and nights around 17.7°C (mean 21.9°C) — warmer than St. Catharines's yearly average — with moderate rainfall (79 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 29.1°C | 24.8°C | 20.5°C | 33.5°C | 15.8°C | 42 mm | 65% | 2.5 m/s | 6.4 |
| 2024 | 27.8°C | 23.7°C | 19.5°C | 30.6°C | 13.4°C | 74 mm | 67% | 2.2 m/s | 6 |
| 2023 | 26.8°C | 22.9°C | 19.1°C | 30.2°C | 16.3°C | 114 mm | 71% | 2.5 m/s | 5.7 |
| 2022 | 27.4°C | 23.2°C | 18.9°C | 30.8°C | 15.1°C | 61 mm | 64% | 2.8 m/s | 6.1 |
| 2021 | 25.9°C | 22.2°C | 18.5°C | 29.7°C | 14.5°C | 103 mm | 73% | 2.8 m/s | 5.2 |
| 2020 🔥 | 29.3°C | 25.1°C | 21.0°C | 33.7°C | 17.9°C | 65 mm | 68% | 2.7 m/s | 6.4 |
| 2019 | 27.2°C | 23.4°C | 19.7°C | 30.1°C | 15.6°C | 96 mm | 74% | 2.5 m/s | 6.3 |
| 2018 | 27.9°C | 23.8°C | 19.8°C | 32.0°C | 16.5°C | 77 mm | 68% | 2.6 m/s | 6.5 |
| 2017 | 25.6°C | 21.9°C | 18.2°C | 29.1°C | 15.4°C | 86 mm | 76% | 2.6 m/s | 5.6 |
| 2016 | 28.1°C | 23.8°C | 19.6°C | 32.3°C | 13.5°C | 41 mm | 65% | 2.9 m/s | 6.2 |
| 2015 | 25.6°C | 21.6°C | 17.6°C | 31.3°C | 12.9°C | 66 mm | 71% | 2.4 m/s | 6.4 |
| 2014 | 24.2°C | 20.5°C | 16.8°C | 28.4°C | 12.6°C | 128 mm | 73% | 3.2 m/s | 5.8 |
| 2013 | 25.9°C | 22.5°C | 19.1°C | 32.1°C | 13.7°C | 96 mm | 77% | 2.7 m/s | 5.8 |
| 2012 | 28.6°C | 24.6°C | 20.5°C | 33.4°C | 18.1°C | 68 mm | 66% | 2.6 m/s | 6.2 |
| 2011 | 28.2°C | 24.0°C | 19.8°C | 32.3°C | 14.9°C | 44 mm | 69% | 2.6 m/s | 6.5 |
| 2010 | 27.6°C | 23.6°C | 19.6°C | 32.3°C | 12.5°C | 94 mm | 70% | 2.7 m/s | 6.2 |
| 2009 | 23.3°C | 19.6°C | 16.0°C | 25.8°C | 12.7°C | 128 mm | 75% | 2.8 m/s | 5.4 |
| 2008 | 25.8°C | 22.1°C | 18.3°C | 28.5°C | 12.9°C | 117 mm | 74% | 2.8 m/s | 5.9 |
| 2007 | 25.7°C | 21.6°C | 17.5°C | 30.8°C | 13.9°C | 65 mm | 66% | 2.6 m/s | 5.8 |
| 2006 | 27.4°C | 23.5°C | 19.6°C | 32.8°C | 13.8°C | 124 mm | 72% | 3 m/s | 5.8 |
| 2005 | 28.5°C | 24.2°C | 20.0°C | 33.9°C | 14.8°C | 79 mm | 67% | 2.7 m/s | 6.2 |
| 2004 | 24.1°C | 20.7°C | 17.2°C | 27.2°C | 13.7°C | 137 mm | 79% | 2.6 m/s | 5.2 |
| 2003 | 23.6°C | 19.3°C | 15.0°C | 28.1°C | 12.0°C | 108 mm | 76% | 2.7 m/s | 5.5 |
| 2002 | 26.0°C | 21.4°C | 16.7°C | 29.2°C | 12.6°C | 82 mm | 70% | 2.7 m/s | 6.5 |
| 2001 | 23.8°C | 19.3°C | 14.7°C | 28.7°C | 8.4°C | 33 mm | 67% | 2.7 m/s | 6.1 |
| 2000 | 23.8°C | 20.3°C | 16.7°C | 27.9°C | 13.3°C | 82 mm | 74% | 2.5 m/s | 5.6 |
| 1999 | 26.6°C | 21.9°C | 17.2°C | 31.9°C | 12.0°C | 51 mm | 68% | 2.9 m/s | 6.2 |
| 1998 | 26.0°C | 22.1°C | 18.2°C | 28.9°C | 14.7°C | 92 mm | 68% | 2.9 m/s | 6 |
| 1997 | 25.5°C | 21.3°C | 17.0°C | 29.2°C | 11.8°C | 51 mm | 69% | 2.9 m/s | 6.1 |
| 1996 | 23.6°C | 18.9°C | 14.2°C | 26.8°C | 10.5°C | 58 mm | 70% | 2.8 m/s | 6.2 |
| 1995 | 25.8°C | 21.2°C | 16.7°C | 31.8°C | 11.6°C | 50 mm | 70% | 2.7 m/s | 5.7 |
| 1994 | 24.9°C | 20.6°C | 16.2°C | 28.5°C | 11.7°C | 52 mm | 74% | 2.6 m/s | 5.9 |
| 1993 | 25.8°C | 21.1°C | 16.5°C | 29.2°C | 11.5°C | 58 mm | 71% | 2.7 m/s | 6.1 |
| 1992 ❄️ 🌧️ | 21.8°C | 17.8°C | 13.7°C | 25.4°C | 10.3°C | 154 mm | 77% | 2.9 m/s | 5.5 |
| 1991 | 25.3°C | 20.8°C | 16.2°C | 29.0°C | 12.1°C | 67 mm | 68% | 2.7 m/s | 6.2 |
| 1990 | 24.0°C | 19.6°C | 15.2°C | 29.1°C | 11.6°C | 73 mm | 72% | 2.7 m/s | 5.7 |
| 1989 | 25.6°C | 21.1°C | 16.6°C | 30.0°C | 12.0°C | 39 mm | 70% | 2.2 m/s | 6.4 |
| 1988 | 27.2°C | 22.1°C | 17.0°C | 34.6°C | 10.8°C | 108 mm | 64% | 2.4 m/s | 5.8 |
| 1987 | 27.0°C | 22.8°C | 18.5°C | 31.6°C | 11.7°C | 72 mm | 71% | 2.8 m/s | 6.1 |
| 1986 | 25.5°C | 21.4°C | 17.3°C | 29.2°C | 11.3°C | 99 mm | 73% | 2.7 m/s | 6 |
| 1985 | 24.6°C | 20.4°C | 16.2°C | 28.1°C | 12.2°C | 60 mm | 69% | 2.9 m/s | 6.3 |
| 1984 | 24.4°C | 20.2°C | 16.0°C | 27.8°C | 10.5°C | 40 mm | 72% | 2.9 m/s | 5.1 |
| 1983 | 26.8°C | 22.5°C | 18.2°C | 31.2°C | 11.8°C | 78 mm | 69% | 3 m/s | — |
| 1982 | 25.8°C | 21.4°C | 17.0°C | 30.0°C | 10.4°C | 58 mm | 69% | 2.6 m/s | — |
| 1981 | 26.3°C | 21.8°C | 17.2°C | 30.8°C | 13.7°C | 89 mm | 69% | 2.5 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 26°C with lows near 17.7°C (mean 21.9°C), based on 45 years of NASA POWER data.
July averages 79 mm of rainfall in St. Catharines, a relatively wet time of year. The wettest on record was 154 mm in 1992.
The hottest July reached 34.6°C in 1988. The coldest dipped to 8.4°C in 2001.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 2.1°C. Daytime highs moved from 25.6°C to 27.4°C and overnight lows from 16.9°C to 19.3°C over the same span.
July is one of the warmer months of the year in St. Catharines and a relatively wet time of year, so plan for around 26°C daytime highs and 17.7°C at night.
Not quite — July is the 12th coolest month in St. Catharines, averaging 21.9°C.
For July in St. Catharines, pack light layers you can adjust through the day, with typical highs of 26°C and lows of 17.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 70% — moderately humid.
Average wind speed in July is 2.7 m/s. The windiest July on record averaged 3.2 m/s (2014).
The wettest July on record was 1992 with 154 mm. On average, July sees 79 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in St. Catharines behaves each July, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for July specifically, along with year-by-year records and how the month has changed over the decades.
